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  • Articles  (16)
  • 1980-1984  (16)
  • 1850-1859
  • Natural Sciences in General  (10)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (5)
  • Economics  (1)
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  • Articles  (16)
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  • 1
    Electronic Resource
    Electronic Resource
    Traditional Participation in a Modern Political System — the Case of Western Nigeria (1980)
    Cambridge : Cambridge University Press
    The @journal of modern African studies 18 (1980), S. 443-468 
    Details
    ISSN: 0022-278X
    Source: Cambridge Journals Digital Archives
    Topics: Ethnic Sciences , History , Political Science , Economics
    Notes: The constitutional development of Nigeria which started under the British occupation has been marked by two fundamental principles: the decision to set the political evolution of the country on a federal basis, and the effort, far less successful, to integrate the traditional institutions into a modern political system. This second principle will be the subject of this article, which I hope will also shed some light on the complex relationships between tradition and modernity, and thus show the importance of ‘primordial loyalties’ in political life.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0022278X00011605
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  • 2
    Electronic Resource
    Electronic Resource
    IR flashes from the X-ray rapid burster (1980)
    [s.l.] : Nature Publishing Group
    Nature 283 (1980), S. 550-551 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The rapid burster was discovered in 1976 by Lewin et al.2 at MIT and is unique in producing 103 X-ray bursts a day in its active periods. These periods occur about every 6 months and last 2-6 weeks3. Liller4, and Kleinmann et al.5 have shown that the source lies in a compact globular cluster, now ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/283550a0
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  • 3
    Electronic Resource
    Electronic Resource
    Anilides and the Spanish toxic oil syndrome (1982)
    [s.l.] : Nature Publishing Group
    Nature 298 (1982), S. 608-608 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] DURING May and June, 1981, an epidemic outbreak of interstitial pneumonitis occurred in Spain. Over 20,000 people were affected, and nearly five per cent subsequently developed persistent neuro-distrophic- and schlerodermia-like conditions. More than 300 people have died. The disease, at first ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/298608a0
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  • 4
    Electronic Resource
    Electronic Resource
    PLATELETS ADHERE WHERE FLOW HAS LEFT FIBRINOGEN ON GLASS (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 416 (1983), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1983.tb35208.x
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  • 5
    Electronic Resource
    Electronic Resource
    Melt behaviour of poly(ethylene oxide)-poly(vinyl acetate) blends (1982)
    Springer
    Polymer bulletin 7 (1982), S. 295-301 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The compatibility of blends of poly(vinyl acetate) and poly(ethylene oxide) has been studied by rheological and thermo-optical analysis. Results from experiments point to the conclusion that there is extensive mixing between the segments of the two macromolecules in the blend. The interaction between the two polymers is manifested by a decrease in the melting point and a continuous decrease in viscosity with decreasing POE content in the mixture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00256796
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  • 6
    Electronic Resource
    Electronic Resource
    Polymerization by phase transfer catalysis (1984)
    Springer
    Polymer bulletin 11 (1984), S. 493-496 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Polyethers from 1,4-bis(chloromethylene)-2,5-dimethoxybenzene and 4,4′-biphenol were obtained by phase transfer catalysis, using different catalysts and solvents. The molecular weights and yields were determined, showing a solvent effect and a influence of the catalysts used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01045326
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  • 7
    Electronic Resource
    Electronic Resource
    Spanish “toxic-oil” syndrome (1983)
    [s.l.] : Nature Publishing Group
    Nature 302 (1983), S. 472-472 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - In their dual aetiology hypothesis for the Spanish toxic oil syndrome1, Root-Bernstein and Westall fail to distinguish between theories and scientific facts. This is precisely one of the major problems we are encountering in Spain when dealing with the several aetiological hypotheses which ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/302472a0
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  • 8
    Electronic Resource
    Electronic Resource
    A pseudo α -helix from poly( α -isobutyl-L-aspartate), a nylon-3 derivative (1984)
    [s.l.] : Nature Publishing Group
    Nature 311 (1984), S. 53-54 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Comparison of a segment of a nylon-3 derivative of the type described here (a) with a peptide unit in a protein (b). In a, R=COOCH2CH(CH3)2. The lateral group R is on the opposite side to that in proteins, as it would be in polypeptide chains prepared from D-amino acids. The polymer was ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/311053a0
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  • 9
    Electronic Resource
    Electronic Resource
    Polymer conformation and viscometric behaviour (1983)
    Springer
    Polymer bulletin 10 (1983), S. 264-270 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The viscometric and refractometric behaviour of poly (benzyl methacrylate) (PBM) in isobutyl methyl ketone (IMK) as a function of the temperature was studied. The viscometric relations in IMK and toluene by membrane osmometry and GPC at 25°C were established. The viscometric results show discontinuities in the intrinsic viscosity [η] in IMK and sharp changes in the conformational and thermodynamic parameters Kθ and B. The variation on the unperturbed dimensions of the polymer chain was attributed to a conformational transition. The influence of the side groups was analyzed. The conformational behaviour of this polymer was compared with the saturated corresponding poly (cyclohexyl methyl methacrylate).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00272234
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  • 10
    Electronic Resource
    Electronic Resource
    The role of coupling agents on the mechanical properties of polymer-impregnated mortars (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 27 (1982), S. 2151-2165 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: An investigation has been carried out for determining the effect of coupling agents on the mechanical properties of polymer-impregnated mortars. Mortar specimens were impregnated with methyl methacrylate (MMA) monomer and α, α-azobis-isobutyronitrile initiator, and polymerized thermally in water. Three titanate coupling agents, KR-33CS, KR-55, and KR-138s, and one silane coupling agent, the A-174, were used for the investigation. Varying amounts of coupling agent were used in impregnating the mortars in situ or in pretreating the mortars with a solvent system. Bulk polymerization of MMA shows no appreciable influence of the coupling agents in the reaction kinetics; however, with the exception of KR-138S, all polymers obtained in the presence of coupling agents came out as insolble. Similar results were obtained for polymers extracted with acetone from mortars. The mechanical property results show an improvement of properties in mortars containing 5.0 vol% of KR-33CS and A-174 after impregnation in situ. A slightly better improvements of mechanical properties were obtained by pretreating the mortar specimens with acetone or toluene/xylene containing coupling agents. Microscopic observation of the fracture surface showed no noticeable difference in the surfaces prepared with and without coupling agents.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1982.070270626
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